Definition
Used to express that one is unable to control or stop oneself from doing something, or experiencing a certain feeling.
忍不住
I couldn't help laughing when he told that joke.
當他講那個笑話時，我忍不住笑了。
She couldn't help smiling when she saw the kittens playing.
當她看到小貓在玩耍時，她忍不住笑了。
Although he tried to remain serious, he couldn't help but laugh.
雖然他試著保持嚴肅，但他還是忍不住笑了。